If I booked Zenyatta's first date

Now that Zenyatta has stated her case for Horse of the Year with her exhilarating victory in Saturday's Breeders' Cup Classic, thoughts turn to the breeding shed.

While it might be nice to see the fabulous 5-year-old Street Cry mare take a shot at breaking Cigar's North American record of 16 wins in a row -- she's presently 14-for-14 lifetime, of course -- the likelihood of her ever racing again is practically zero. So, now to speculate on who that breeding date for Zenyatta might be.

Maybe it's too conventional in thinking, but I would first consider Giant's Causeway.

Zenyatta carries no Northern Dancer, so adding some over a Mr. Prospector-line mare is hard to quibble with. The cross does offer 4x4 inbreeding to Roberto and 5x5 Halo, which adds up to a linebreeding of 6S x 5S x 6D x 5D Hail to Reason.

Giant's Causeway at this writing is No. 4 all-time in progeny earnings on synthetic surfaces (one notch behind Street Cry), which should make Zenyatta's connections of owner Jerry Moss and trainer John Shirreffs happy, since they're based in California where all the major tracks are mandated to have all-weather surfaces instead of conventional dirt. But Giant's Causeway can get any sort of horse. He has multiple G1 progeny winners on dirt, turf and synthetics.

What's not to like?

Another consideration for Zenyatta, in my estimation, is to avoid the chance of adding too much size to her prospective foals. Zenyatta is as big a mare as you'll find; she stands more than 17 hands high. Sending her to a whopper of a stallion could result in babies who are so big they can't move fast enough to get out of their own way. Or that can't stay sound. Despite Zen's clearly overcoming the "too-much-size" pitfalls (perhaps in part because of masterful management by Shirreffs, who only raced her 14 times in a three-year career), it's my belief that an average-sized or even smaller horse is generally better both for athleticism and soundness.

Giant's Causeway has good size, but at 16.1 hands he isn't a monster.

In a few pedigree discussion groups, I've witnessed other recommendations for Zenyatta. One person suggested Hard Spun, who I like on pedigree. But if Zen were my mare and I were breeding to keep and race the foals -- as Moss likely will be -- then I wouldn't choose a stallion whose first runners are yet to prove themselves.

It would be easy enough to make cases for plenty of other top stallions, and for two more top choices, I would look to Awesome Again and big-splash youngster Medaglia D'Oro, the latter of whom is sire of Zenyatta's off-track (but never on-track) rival, splendid filly Rachel Alexandra.

But my top pick would be Giant's Causeway -- performance plus all-surface versatility.

Have ideas of your own? Please detail them in the comments section below.